﻿using System;

namespace TestA
{
    class Program
    {
        static void Main(string[] args)
        {


            //object ss = "vvv";
            //if (string.IsNullOrEmpty(ss?.ToString()))
            //{
            //    Console.WriteLine("ssss");
            //}


            string a = "111";

            string b = a;

            b = "22";

            Console.WriteLine(a);

            Console.WriteLine(b);

            Console.WriteLine("Hello World!");

            Console.ReadKey();
        }




        
    }
}
